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/*
* TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
* device functionality on Windows.
*
* This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
*
* This source code is Copyright (C) 2002-2008 OpenVPN Technologies, Inc.,
* and is released under the GPL version 2 (see below), however due
* to the extra costs of supporting Windows Vista, OpenVPN Solutions
* LLC reserves the right to change the terms of the TAP-Win32/TAP-Win64
* license for versions 9.1 and higher prior to the official release of
* OpenVPN 2.1.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef TAP_TYPES_DEFINED
#define TAP_TYPES_DEFINED
typedef struct _Queue
{
ULONG base;
ULONG size;
ULONG capacity;
ULONG max_size;
PVOID data[];
} Queue;
typedef struct _TapAdapter;
typedef struct _TapPacket;
typedef union _TapAdapterQuery
{
NDIS_HARDWARE_STATUS m_HardwareStatus;
NDIS_MEDIUM m_Medium;
NDIS_PHYSICAL_MEDIUM m_PhysicalMedium;
UCHAR m_MacAddress [6];
UCHAR m_Buffer [256];
ULONG m_Long;
USHORT m_Short;
UCHAR m_Byte;
}
TapAdapterQuery, *TapAdapterQueryPointer;
typedef struct _TapExtension
{
// TAP device object and packet queues
Queue *m_PacketQueue, *m_IrpQueue;
PDEVICE_OBJECT m_TapDevice;
NDIS_HANDLE m_TapDeviceHandle;
ULONG m_TapOpens;
// Used to lock packet queues
NDIS_SPIN_LOCK m_QueueLock;
BOOLEAN m_AllocatedSpinlocks;
// Used to bracket open/close
// state changes.
MUTEX m_OpenCloseMutex;
// True if device has been permanently halted
BOOLEAN m_Halt;
// TAP device name
unsigned char *m_TapName;
UNICODE_STRING m_UnicodeLinkName;
BOOLEAN m_CreatedUnicodeLinkName;
// Used for device status ioctl only
const char *m_LastErrorFilename;
int m_LastErrorLineNumber;
LONG m_NumTapOpens;
// Flags
BOOLEAN m_TapIsRunning;
BOOLEAN m_CalledTapDeviceFreeResources;
}
TapExtension, *TapExtensionPointer;
typedef struct _TapPacket
{
# define TAP_PACKET_SIZE(data_size) (sizeof (TapPacket) + (data_size))
# define TP_TUN 0x80000000
# define TP_SIZE_MASK (~TP_TUN)
ULONG m_SizeFlags;
UCHAR m_Data []; // m_Data must be the last struct member
}
TapPacket, *TapPacketPointer;
typedef struct _TapAdapter
{
# define NAME(a) ((a)->m_NameAnsi.Buffer)
ANSI_STRING m_NameAnsi;
MACADDR m_MAC;
BOOLEAN m_InterfaceIsRunning;
NDIS_HANDLE m_MiniportAdapterHandle;
LONG m_Rx, m_Tx, m_RxErr, m_TxErr;
#if PACKET_TRUNCATION_CHECK
LONG m_RxTrunc, m_TxTrunc;
#endif
NDIS_MEDIUM m_Medium;
ULONG m_Lookahead;
ULONG m_MTU;
// TRUE if adapter should always be
// "connected" even when device node
// is not open by a userspace process.
BOOLEAN m_MediaStateAlwaysConnected;
// TRUE if device is "connected"
BOOLEAN m_MediaState;
// Adapter power state
char m_DeviceState;
// Info for point-to-point mode
BOOLEAN m_tun;
IPADDR m_localIP;
IPADDR m_remoteNetwork;
IPADDR m_remoteNetmask;
ETH_HEADER m_TapToUser;
ETH_HEADER m_UserToTap;
MACADDR m_MAC_Broadcast;
// Used for DHCP server masquerade
BOOLEAN m_dhcp_enabled;
IPADDR m_dhcp_addr;
ULONG m_dhcp_netmask;
IPADDR m_dhcp_server_ip;
BOOLEAN m_dhcp_server_arp;
MACADDR m_dhcp_server_mac;
ULONG m_dhcp_lease_time;
UCHAR m_dhcp_user_supplied_options_buffer[DHCP_USER_SUPPLIED_OPTIONS_BUFFER_SIZE];
ULONG m_dhcp_user_supplied_options_buffer_len;
BOOLEAN m_dhcp_received_discover;
ULONG m_dhcp_bad_requests;
// Help to tear down the adapter by keeping
// some state information on allocated
// resources.
BOOLEAN m_CalledAdapterFreeResources;
BOOLEAN m_RegisteredAdapterShutdownHandler;
// Multicast list info
NDIS_SPIN_LOCK m_MCLock;
BOOLEAN m_MCLockAllocated;
ULONG m_MCListSize;
MC_LIST m_MCList;
// Information on the TAP device
TapExtension m_Extension;
} TapAdapter, *TapAdapterPointer;
#endif
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